Study of intermolecular interactions in aqueous solutions by millimeter spectroscopy

The absorption of millimeter electromagnetic radiation (v=1.4, 1.71, and 5 cm⁻¹) by aqueous solutions of glycine (pH 6.1–6.2) in the concentration range of 0.5–2.5 mol L⁻¹ was measured. It was found that the absorbing ability of the water present in the solutions, is higher than that of pure water. This phenomenon is explained by the presence of a center of negative hydration in the structure of the glycine zwitterion, which results in an increase in the rotational mobility of water molecules immobilized in the hydrate shell of the glycine zwitterion. For Part 5, see Ref. 1. Deceased. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1305–1307, July, 1997.     

Asymptotic solution of a system of integro-differential equations

An asymptotic solution of a system of inegro-differential equations is constructed for the case where turning points are present. Vinnychenko Kirovograd Pedagogic Institute, Kirovograd. Translated from Ukrainskii Matematicheskii Zhurnal. Vol. 49, No. 12, pp. 1617–1623, December, 1997     

Intermolecular interactions in aqueous solutions of mebicar

Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1178–1179, June, 1995.     

Effect of urea on the structure and functional activity of proteins. Chymotrypsinogen A and α-chymotrypsin

The effect of urea on the structural stability and functional activity of globular proteins,viz., chymotrypsinogen A (ChtG) and -chymotrypsin (Cht), was studied over a wide range of concentrations (0.5–6 rnol L-1), and the existence of two different mechanisms of the action of urea on these proteins was demonstrated. No changes in the spatial structure of ChtG were observed in the concentration range from 0,5 to 3 mol L^–1 (region 1). Differential UV spectroscopy shows tile redistribution of aromatic groups between the inner volume and the outer surface of a protein molecule (protein denaturation) at concentrations >3 mol L^–1 (regionII), In regionI, urea changes the kinetic parameters of enzymatic reactions involving Cht, which is explained on the basis of millimeter spectroscopy data by its action on the structure and nucleophilic reactivity of water.Deceased.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 998–1002, April, 1996.     

Systems of singularly perturbed degenerate integro-differential equations

We construct asymptotic solutions of singularly perturbed homogeneous and inhomogeneous systems of integro-differential Fredholm-type equations with a degenerate matrix as the coefficient of the derivative. Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 51, No. 12, pp. 1694–1703, December, 1999.     

On the asymptotic integration of a singularly perturbed system of linear differential equations with deviating argument

We prove the existence and infinite differentiability of a solution of a singularly perturbed linear system of differential equations with deviating arguments and a turning point.     

Asymptotic integration of systems of integro-differential equations with degeneracies

We construct asymptotic solutions of singularly perturbed homogeneous and heterogeneous systems of integro-differential Fredholm-type equations with degenerate matrix at the derivative. Translated from Ukrainskii Matematicheskii Zhumal, Vol. 51, No. 2, pp. 170–180, February, 1999.